I'm sorry, but it seems like you're blowing this out of proportion.
You submitted a chapter
Their automated crawlers got some hits and they asked for confirmation that you wrote it, and you gave it.
They gave you the exact hits and asked you to confirm that it was all you, you did.
Sounds like a company taking some pretty simple precautions. They could edit their code to check for names too, but there's enough people out there with the same names that it's likely not worth the effort.
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